include(CheckIncludeFiles)
include(CheckFunctionExists)
include(CheckLibraryExists)
include(CheckSymbolExists)
include(CheckTypeSize)
include(CheckCSourceCompiles)
include(CheckCXXSourceCompiles)

#CHECK_INCLUDE_FILES(strings.h HAVE_STRINGS_H) 

#if(NOT HAVE_STRINGS_H)
#    message(FATAL_ERROR "strings.h not found")
#endif()